Casey Anthony Say's she got pregnant from passing out at a party.

Casey Anthony told a psychiatrist that she got pregnant with her daughter, Caylee, after passing out at a party when she was  18 years old, according to what the doctor said,  tests gave no indication that Anthony was mentally ill as she faced her murder trial.

The 25-year-old Anthony was acquitted last July of killing her 2-year-old daughter, Caylee, in a trial that caught  the nation's attention. Anthony didn't know who the father of  Caylee was, the psychiatrist, Jeff Danziger, recounted in a deposition that was unsealed by a Florida judge and released Wednesday. Danziger interviewed Anthony five times over a  two year period, but never testified at her murder trial.

"Two beers, possibly given another drug. Woke up passed out," said Danziger, reading from notes he took during an interview with Anthony in November 2010. "Don't remember anything at a party, age 18. This is how she said she got pregnant."

Anthony is serving a year of probation at an undisclosed location in Florida on a check fraud charge.

How do you "wake up passed out"?    

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